Method of making male elements for hinge devices and hinge devices obtained thereby专利检索- .铰链专利检索查询-专利查询网

Method of making male elements for hinge devices and hinge devices obtained thereby
申请号	EP86100126	申请日	1986-01-07	公开(公告)号	EP0187656A3	公开(公告)日	1986-10-01
申请人	OTLAV S.p.A.;			发明人	Manzalini, Norberto;
摘要	The present invention has for its subject a hinge and a method of forming a closed cavity hollow male hinge. The method comprises a first processing step consisting of shearing a section from a cylindrival drawn blank followed by cold impact reverse-extrusion by means of a punch and die action; that step causes the material to be upturned laterally to form a constant pattern hollow body having an open end. Thereafter, there is carried out on said hollow body, as by striking with a die, a reduction of one portion thereof at the open end, thus defining a hollow pin. The open end of the latter is then upset and stopped to make the hollow body watertight.
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